| 气相中乙酸乙酯光解的光子效率:波长和催化剂的影响 |
| 摘要点击 2338 全文点击 1562 投稿时间：2014-11-27 修订日期：2015-01-15 |
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| 中文关键词 光子效率 乙酸乙酯 辐射光谱 XeCl*/KrCl*/XeBr*/KrBr* 催化剂 |
| 英文关键词 photonic efficiency ethyl acetate irradiation spectrum XeCl*/KrCl*/XeBr*/KrBr* catalyst |
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| 中文摘要 |
| 采用4种不同波长的准分子光源(XeCl*、KrCl*、XeBr*和KrBr*)降解气相的乙酸乙酯. 对比了外加3种负载型光催化剂(有机膜负载TiO2、有机膜负载石墨烯和纱网负载TiO2)条件下乙酸乙酯的去除率,考察了光源类型、辐射功率和气体初始浓度对去除率的影响. 同时,测定了不同光源的辐射光谱和辐射功率,计算了不同反应条件下的光子效率. 结果表明,乙酸乙酯去除率按KrBr* >KrCl* >XeCl* >XeBr*依次降低,而XeCl* 和KrBr*光源降解乙酸乙酯气体可以得到较高的光子效率; 有机膜负载TiO2比不加催化剂时乙酸乙酯去除率和光子效率都有所提高, 但提高幅度不大. 气体流速和乙酸乙酯初始浓度升高,光子效率升高. 采用KrBr*准分子灯直接光解乙酸乙酯,实验条件为:辐射功率0.76 W,乙酸乙酯初始浓度946 mg·m-3,气体流速600 mL·min-1,光子效率为5.63%. |
| 英文摘要 |
| Four kinds of excilamps with different wavelengths (XeCl*, KrCl*, XeBr* and KrBr*) were used for removing ethyl acetate in gas phase. The removal efficiencies of ethyl acetate by three loaded catalysts (TiO2 loaded on organic film, graphene loaded on organic film, and TiO2 loaded on mesh) were compared, and the effects of lamp sources, irradiation power and initial concentration on the removal efficiency were also investigated. Moreover, irradiation spectra and power of light sources were determined, and photonic efficiencies under different reaction conditions were calculated. The experimental results showed that the removal efficiency of ethyl acetate decreased in the order of KrBr* >KrCl* >XeCl* >XeBr*, while the photonic efficiency seemed to be relatively high with both XeCl* and KrBr* excilamps. In the presence of the catalyst of TiO2 loaded on organic film, both the removal efficiency and the photonic efficiency were higher than those without catalyst, but the increment was not significant. The photonic efficiency increased with increasing initial concentration and gas flow rate. With KrBr* excilamp, a photonic efficiency of 5.63% was obtained when the experimental conditions were set as: irradiation power of 0.76 W, initial concentration of 946 mg·m-3, and gas flow rate of 600 mL·min-1. |
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